Extech Instruments 407790A User Manual Download

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407790A-EN_V2.4 1/20

Descriptions

2.1 Meter Description

Refer to the diagram below for the following descriptions.

Windscreen

Microphone

Display

Operation keys

6VDC adapter jack

DC analog output jack

AC analog output jack

Comparator output jack

Trig IN jack

10.

Micro SD card slot

11.

Power switch

12.

Hand strap

13.

USB port

14.

Battery compartment

15.

Tripod mounting screw

Summary of Contents for 407790A

Page 1: ...User Manual Real Time Octave Band Analyzer Model 407790A Additional User Manual Translations available at www extech com ...

Page 2: ... 19 3 6 Comparator Output Operation 20 3 7 Trigger Mode Setup and Operation 23 4 MEASUREMENTS 27 4 1 Sound Level Measurements 27 4 2 SEL Leq Lmax Lmin LN Measurements 28 4 3 Sound Level and Octave Band Analysis Measurement 30 4 4 Sound Band Leq SEL Lmax Lmin and LN Analysis Measurement 32 5 STORING DATA TO MEMORY 34 5 1 Manual Memory Storage 34 5 2 Recalling Manually Stored Data 37 5 3 Erasing Man...

Page 3: ... Level SEL Sound Exposure Level Lmax Maximum Sound Pressure Level and Lmin Minimum Sound Pressure Level The built in memory stores 12 280 data records in sound level mode and 1024 records in Octave mode The stored data can be easily transferred to a PC with the 407790A software and USB cable This meter permits choice of A C or Flat Z weighting and Slow Fast impulse response times AC and DC analog ...

Page 4: ...light during storage and use Protect the instrument from air with high salt or sulfur content gases and stored chemicals as this may damage the delicate microphone and sensitive electronics Always switch the instrument off after use Remove the batteries from the instrument if it is not to be used for a long period of time Do not leave exhausted batteries in the instrument as they may leak and caus...

Page 5: ...vel and graphic recorder Comparator output function External trigger input function Real time clock with calendar Main channel sound meter analyzer mode Sub Channel sound level meter mode The 407790A allows the following quantity measurements Simultaneous measurements of all items with selected time weighting and frequency characteristics Sound level Lp Equivalent continuous sound Leg Sound exposu...

Page 6: ... following descriptions 1 Windscreen 2 Microphone 3 Display 4 Operation keys 5 6VDC adapter jack 6 DC analog output jack 7 AC analog output jack 8 Comparator output jack 9 Trig IN jack 10 Micro SD card slot 11 Power switch 12 Hand strap 13 USB port 14 Battery compartment 15 Tripod mounting screw ...

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Page 8: ...nge for measurement The following five settings are available 20 to 90 dB 20 to 100 dB 20 to 110 dB 30 to 120 dB 40 to 130 dB GRP NUM button Press to switch between graph and numeric display for Octave measurements SLM 1 1 1 3 button Press to switch to select the sound level meter display and analysis screen SLM 1 1 1 3 1 1 1 3 MENU Press to enter menu screen to setup various menu parameters Press...

Page 9: ...se Z The TIME WEIGHT selects the time weighting function for the main channel F S 10ms I Fast 125ms Slow 1000ms 10ms Impulse 35ms Note The frequency and time weighting for the sub channel can be selected by accessing the menu screen button Backlight Enter Backlight powers on the display backlight Press the button again to turn backlight off When automatic Backlight Off function is selected from th...

Page 10: ...e start behavior Available modes are Level 1 LV1 Level 2 LV2 EXT EXT and time TIME 5 Elapsed Time Displays the elapsed time in seconds during processing and storing memory 6 Memory Displays the selected memory for storing data FL The data will be stored in the internal memory of the meter Sd The data will be stored on the micro SD card Mode of analysis Measurement in progress symbol USB link statu...

Page 11: ... 125ms S Slow 1000ms τ 10ms I Impulse 35ms 15 Main channel level display Displays the measured sound level in the main channel The display is updated every second 16 Sub channel frequency weighting Indicates the sub channel frequency weighting characteristic A A weighting C C weighting Z Z weighting Flat response The sub channel frequency weighting can be set from the menu screen 17 Sub channel ti...

Page 12: ...12 407790A EN_V2 4 1 20 2 4 Analysis screen An example for the 1 1 1 3 OCT analysis screen is shown below Use the and buttons to move the cursor to the target frequency band 1 1 and 1 3 analysis screen ...

Page 13: ...13 407790A EN_V2 4 1 20 2 5 Numeric Display screen Example for 1 1 OCT 1 3 OCT and 1 1 1 3 OCT analysis screen are shown below Use the and buttons to view a frequency that is not displayed ...

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Page 15: ...s not in use 3 1 Setting the Date and Time Date and time information is stored with each record saved Set the date and time as follows 1 Press power switch ON and wait until the measurement screen appears 2 Press the MENU button The menu list screen will display 3 Press the button to select D Date setting Y M D and then press the enter button 4 Press the button to set the value Press button to con...

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Page 17: ... the card in carefully until it is properly sealed 2 To remove push the card The SD card with pop out and can be removed 3 3 Setting the Backlight Auto Off time 1 Press the to turn the backlight on or off 2 Press the MENU key to bring up the menu list screen 3 Use the key to select Backlight Auto Off then press the key 4 Use the key to select the automatic turn off time then press the key Options ...

Page 18: ... button 3 Use the button to select the desired time weighting F S τ 10ms or I Impulse 35ms then press button 4 Press the buttons to select H Sub Freq Weight then press button 5 Press the buttons to select the desired frequency weighting A C or Z then press button 6 Press MENU button to return to the measurement screen Note There is no frequency analysis function for the sub channel Only the all pa...

Page 19: ...ass minimum The analysis result applies to the band pass level values excluding the sub channel all pass levels taken at the point where the all pass level in the main channel was maximum minimum within the sampling period The sub channel all pass level is taken at the maximum minimum point within the sampling period independently of the main channel level 1 Press the MENU button to enter the menu...

Page 20: ...tor then press button to display the ON OFF setting 3 Press the buttons to select ON then press button 4 Press the buttons again to select 1 Comparator Level Set the desired level then press button Setting range 25 to 130dB 1 dB steps 5 Follow the above steps to select 2 Comparator Band Set the band to desired level then press button MAIN AP 31 5Hz 63Hz 8kHz or 1 3 octave bands 6 Press the MENU bu...

Page 21: ...21 407790A EN_V2 4 1 20 AP AP AP AP ...

Page 22: ...1 OCT mode only the AP or 1 1 octave band is selected as comparator band Comparator output Open collector output band level determination Max applied voltage 24VDC Max drive current 50mADC 1 Comparator signal output continues for 0 5 seconds after the signal crosses the threshold level 2 Comparator Level 3 Time ...

Page 23: ... AP 31 5Hz 63Hz 125Hz 8kHz 1 3 octave bands Level trigger 2 Single measurement is made when trigger level is exceeded The trigger level is valid at any time Setting items Trigger Level 25 to 130dB 1 dB steps Trigger Band MAIN AP 31 5Hz 63Hz 125Hz 8kHz 1 3 octave bands Time trigger This is a reoccurring trigger timer that starts a measurement after a trigger timer The measurement ends after the mea...

Page 24: ...ime 2 Set the Trigger Band AP or Octave band frequency 3 For Level 1 and 2 chose the Trigger level in dB 4 External Trigger chose slope or 3 7 2 External Trigger Setting 1 Press the MENU button to enter the menu list screen 2 Use the buttons to select K Trigger then press the button 3 Use the buttons to select EXT then press the button 4 Press the MENU button to return to the measurement screen AP...

Page 25: ...ess the button 3 Use the buttons to select TIME then press the button 4 Use the buttons to select 2 Trigger Band then press the button 5 Use the and buttons to set the value to AP then press the button 6 Use the buttons to select 3 Trigger Time then press the button 7 Use the and buttons to set the value of the reoccurring trigger timer Hour Minute Second then press the button 8 Press the MENU but...

Page 26: ...utton 6 Use the buttons to select 2 Trigger Band then press the button 7 Use the buttons to select the desired trigger band then press the button 8 Use the buttons to select 4 Slope Type then press the button 9 Use the buttons to select the desired trigger slope or Slope Then press the button Note For LEVEL 2 trigger ignore the slope setting and only use the Slope trigger 10 Press the MENU button ...

Page 27: ...ng characteristic For normal sound level measurements select the A setting 3 Use the FREQ WEIGHT TIME button to select the Main Channel time weighting characteristic For normal sound level measurements select the F Fast setting 4 Use the LEVEL buttons to set the dB level range Choose a setting in the middle of the display range of the main channel bar graph indicator If the OV or UN indicators app...

Page 28: ...rements select the F Fast setting This setting does not affect a measurement result of continuous sound level mode Note The meter performs high speed sampling of the sound pressure waveform to determine Leq and SEL It is not affected by the time weighting characteristics 4 Use the LEVEL buttons to set the level range The main channel bar graph indicator should be in the middle of the range If the ...

Page 29: ...ge data are comprised in the processed values During measurement the PAUSE CONT key can be used to paused and resume the measurement During pause the pause symbol is shown The paused interval is not included in the measurement time Important During measurement the LEVEL button FREQ WEIGHT TIME button TIME WEIGHT and SLM RTA function are disabled Be sure to complete all settings before starting the...

Page 30: ... range If the OV or UN indicators appear change the level range setting 6 The level indicator displays the currently measured Sound band level Use the GRP NUM button to toggle the measurement screen between graph and numeric display If the graph display is selected use the and buttons to move the cursor to the desired frequency band In the 1 1 1 3 OCT numeric display frequencies that are currently...

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Page 32: ...e measurement time setting 10 Press MENU key to return to the measurement screen 11 Press the START STOP key to start the measurement The previous measurement values will be cleared While the measurement is in progress the symbol flashes and the elapsed time is displayed When the measurement time has elapsed the measurement is terminated automatically To terminate the measurement before the alloca...

Page 33: ...en graph and numeric display In graph display use the and buttons to move the cursor to the desired frequency band In the 1 1 1 3 OCT numeric display frequencies that are not displayed can be called up with the and buttons The PAUSE CONT button can be used to stop and resume the updating of band level indication In the pause condition a pause symbol appears on the display The pause interval is not...

Page 34: ... Analyzer mode Continuous store of main channel sound level Lp values for each band and all pass values sub channel all pass values as 1 set at preset record interval time Auto 2 Sound level meter mode Continuous store of main channel and sub channel all pass values as 1 set at preset measurement integrate time Octave Analyzer mode Continuous store of main channel sound level Lp values for each ba...

Page 35: ...ey 7 Press the MENU button to return to the measurement screen 8 Press the R button The sound level will be recorded If processing was being carried out the processed values at the point where the R key is pressed will also be recorded The store process takes about 1 second When it is completed the address is incremented by one step which allows you to record multiple data simply by pressing the R...

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Page 37: ...ton 4 Use the buttons to select the store address whose data you want to recall then press the button The data stored in memory will display 5 In analyzer mode the GRP NUM key can be used to switch between numeric display and graph display 6 Press the button and or buttons to select a different store address whose data you want to recall 7 Press the MENU button two times to exit this mode ...

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Page 39: ...en 2 Use the buttons to select L Clear Record then press the button 3 Use the buttons to select MANUAL then press the button A confirmation message will appear To erase the data press the button To cancel the process press the MENU button Note you can also erase the manual memory from the software AP AP AP AP ...

Page 40: ...9s then press the button 9 Use the buttons to select A Measurement time then press the button 10 Use the and button to set the desired measurement time from 1 second to 23h59m59s then press the button Note Measurement Time must be greater than or equal to the set Interval Time 11 Set the other measurement parameters trigger mode sub channel etc as required using the MENU button to select setting i...

Page 41: ...tep Note When memory block address 250 is reached the AFul symbol is displayed and no more data can be stored The AUTO recording of data can only be read by PC it cannot be recalled by the meter 1 Measurement time duration of test 2 Measurement time duration of test 3 Measurement Stop or Memory full is reached AFu 4 Interval time sample time 5 Trigger time or Trigger event ...

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Page 44: ...ime then press the button 8 Press the and the buttons to set the desired measurement integrated time from 1 second to 23h59m59s then press the key 9 Use the buttons to select A Measurement time then press the button 10 Use the and buttons to set the desired measurement time from 1 second to 23h59m59s then press the button Note Measurement Time must be greater than or equal to the set Interval Time...

Page 45: ...st screen 2 Use the buttons to select L Clear Record then press the button 3 Use the buttons to select Auto then press the button A confirmation message appears To erase the data press the button To cancel the process press the MENU button Note you can also erase the manual memory from the software ...

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Page 47: ...H COM web page located under the Software downloads section SAVE the 407790A software to your PC Perform an Extract All to unZIP the files Run ExtechInstaller exe to install the software There is no USB driver as the meter attaches as a Human Interface device The software has a Help manual available to understand the full operation ...

Page 48: ...rms measured sound pressure level P0 rms reference sound pressure level 20 Pa 3 Leq level equivalent continuous Leq is used to assess the rms average noise level over a preset period of time often the starting point of a noise assessment To take a Leq measurement the period of time over which it is to be made must be selected The longer the period of measurement time the more accurate the Leq read...

Page 49: ...ower ON until CAL appears on the screen 3 Insert the microphone into the opening of the acoustical calibrator 4 Switch the calibrator ON 1kHZ 94dB or 114dB 5 Use the and buttons to adjust the reading of the meter to match the sound calibrator s output value adjust range from 12 8 to 12 7dB 6 Press the button to store the calibrated value 7 Switch the calibrator and sound meter OFF 8 Remove the cal...

Page 50: ... out For the sub channel only all pass processing is carried out Processing types in each operation mode Channel Main Sub Sound level meter mode AP OCT AP AP Frequency weighting A C Z A C Z Time weighting F S 10ms I F S 10ms I Measurement values Lp Leq SEL Lmax Lmin LN Lp Leq SEL Lmax Lmin LN Analyzer mode AP OCT AP OCT AP Frequency weighting A C Z A C Z Time weighting F S 10ms I F S 10ms I Measur...

Page 51: ...gger event recurrence interval trigger time is set Store Sound level values and processing results are stored in manual store or auto store mode Data can be stored in internal memory or on micro SD card Manual store Data for measurement results and measurement start time are stored manually in single address increments Data store capacity max 250 data sets Auto store Measurement results are stored...

Page 52: ...ia communication commands Power Four 4 C size 1 5V alkaline batteries Battery Life Approx 2 hours External DC power supply 6 VDC 1A Operating Temperature Humidity 10 to 50oC 14 to 122oF 10 to 90 RH Storage Temperature Humidity 10 to 60oC 14 to 140oF 10 to 75 RH Environment conditions Altitude up to 2000 meters Dimensions Weight 34 5 10 6cm 13 6 H x 4 0 W x 2 4 D Approx 950g 33 5 oz including batte...

Page 53: ...r most of our products Contact us for information on calibration and repair availability refer to the contact information below Annual calibrations should be performed to verify meter performance and accuracy Product specifications are subject to change without notice Please visit our website for the most up to date product information www extech com Contact Customer Support Customer Support Telep...

Page 54: ... para obtener información sobre la disponibilidad de calibración y reparación consulte la información de contacto a continuación Se deben realizar calibraciones anuales para verificar el funcionamiento y la precisión del medidor Las especificaciones del producto están sujetas a cambios sin aviso Por favor visite nuestro sitio Web para obtener la información de producto más actualizada www extech c...

Page 55: ...duits Pour plus d informations sur la disponibilité des services d étalonnage et de réparation contactez nous reportez vous aux informations de contact ci dessous Des étalonnages annuels doivent être réalisés afin de vérifier les performances et la précision du compteur Les spécifications produit sont sujettes à modification sans préavis Veuillez consulter notre site Web pour obtenir les informati...

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